<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./js/vue.js"></script>
</head>
<body>
     <div id="box">
       <button @click="add(123)">按钮</button>
     </div>
    <script>
     const vm=    new Vue({
             el:"#box",
             data:{
              
             },
             methods: {
                add(e){
                   alert(e) 
                }
             },
         })
       
    </script>
</body>
</html>